A weaker weight condition for the John–Nirenberg implication

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Let vv be a weight on the unit disk and let pp be the parameter appearing in Proposition 1. Assume that the function x↦v(1−x)x1p−ϵx\mapsto v(1-x)x^{\frac{1}{p}-\epsilon} is almost increasing for some ϵ>0\epsilon>0. The weaker-weight conjecture. This assumption can be replaced by the milder condition

inf⁡x∈(0,1)v(x)>0.\inf_{x\in (0,1)}v(x)>0.

The proposed replacement would weaken the hypotheses of the proposition and potentially extend its John–Nirenberg-type conclusion to a broader class of weights.

References

Primary source

David Norrbo, “Compactness and related properties of weighted composition operators on weighted BMOA spaces”, arXiv:2502.05533 (2025).

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